Kubernetes 状态管理与扩展

Kubernetes中文指南/云原生应用架构实践手册(201910)

如何从零开始编写一个 Kubernetes CRD。

sample git repo

各个组件开发指导

operator 介绍

此图来自谷歌员工的实践介绍

client-go的使用和源码分析

(dlv) p pods

*k8s.io/api/core/v1.PodList {

        TypeMeta: k8s.io/apimachinery/pkg/apis/meta/v1.TypeMeta {Kind: "", APIVersion: ""},

        ListMeta: k8s.io/apimachinery/pkg/apis/meta/v1.ListMeta {

                SelfLink: "/api/v1/pods",

                ResourceVersion: "145208",

                Continue: "",},

        Items: []k8s.io/api/core/v1.Pod len: 8, cap: 8, [

                (*k8s.io/api/core/v1.Pod)(0xc00033a000),

                (*k8s.io/api/core/v1.Pod)(0xc00033a360),

                (*k8s.io/api/core/v1.Pod)(0xc00033a6c0),

                (*k8s.io/api/core/v1.Pod)(0xc00033aa20),

                (*k8s.io/api/core/v1.Pod)(0xc00033ad80),

                (*k8s.io/api/core/v1.Pod)(0xc00033b0e0),

                (*k8s.io/api/core/v1.Pod)(0xc00033b440),

                (*k8s.io/api/core/v1.Pod)(0xc00033b7a0),

        ],}

　　

从运行流程和list-watch看kubernetes系统的设计理念

开发operator扩展kubernetes 调研整理

如何基于Kubernetes开发自定义的Controller

Kubernetes CRD (CustomResourceDefinition) 自定义资源类型

kubernetes系列之十四：Kubernetes CRD(CustomResourceDefinition)概览

kubernetes系列之十六：Kubernetes CRD sample-controller的编译和测试

This Picture from this blog and official doc

Analyzing value of Operator Framework for Kubernetes community

Install GO:

wget -O- https://raw.githubusercontent.com/udhos/update-golang/master/update-golang.sh  | sudo bash

export PATH=$PATH:/usr/local/go/bin

go env |grep GOPATH >> ~/.profile

go env |grep GOROOT >> ~/.profile

echo "export GOPATH" >> ~/.profile

echo "export GOROOT " >> ~/.profile

echo "export PATH=\$PATH:/usr/local/go/bin:$GOPATH/bin:$GOROOT/bin" >> ~/.profile

source ~/.profile

install sample:

go get github.com/tools/godep

cd $GOPATH/src

git clone https://github.com/kubernetes/sample-controller.git

cd sample-controller

godep restore
cd $GOPATH/src/k8s.io/sample-controller

go build -o sample-controller .

debug:

go get github.com/derekparker/delve/cmd/dlv

dlv exec ./sample-controller -- -kubeconfig=$HOME/.kube/config

分析:

main.go

1.  获取配置信息（构建client使用）

clientcmd.BuildConfigFromFlags(masterURL, kubeconfig)

从"/home/ubuntu/.kube/config" 获取登陆的证书, key和CA

2. 生成一个client，来登陆api server

// "k8s.io/client-go/kubernetes"

kubeClient, err := kubernetes.NewForConfig(cfg)

3. 生成一个sample的client，用户来登陆controller

// clientset "k8s.io/sample-controller/pkg/client/clientset/versioned"

clientset.NewForConfig(cfg)

4.  分别生成 kubeInformerFactory 和 exampleInformerFactory

// kubeinformers "k8s.io/client-go/informers"

// informers "k8s.io/sample-controller/pkg/client/informers/externalversions"

// SharedInformerFactory a small interface to allow for adding an informer without an import cycle

type SharedInformerFactory interface {

        Start(stopCh <-chan struct{})

        InformerFor(obj runtime.Object, newFunc NewInformerFunc) cache.SharedIndexInformer

}

// SharedInformerOption defines the functional option type for SharedInformerFactory.

type SharedInformerOption func(*sharedInformerFactory) *sharedInformerFactory

type sharedInformerFactory struct {

        client           versioned.Interface

        namespace        string

        tweakListOptions internalinterfaces.TweakListOptionsFunc

        lock             sync.Mutex

        defaultResync    time.Duration

        customResync     map[reflect.Type]time.Duration

        informers map[reflect.Type]cache.SharedIndexInformer

        // startedInformers is used for tracking which informers have been started.

        // This allows Start() to be called multiple times safely.

        startedInformers map[reflect.Type]bool

}

　reflect.Type  Go Reflect

SharedInformer具有共享数据缓存，并且能够将对缓存更改的通知分发给通过AddEventHandler注册的多个listeners。 如果使用此方法，则与标准Informer相比，有一个行为不同。 当您收到通知时，缓存将至少与通知一样的fresh，甚至更fresh。 您不应该依赖缓存的内容与处理函数中收到的通知完全匹配。 如果创建后紧接着是删除，则缓存可能没有这个条目了。 这比广播者有优势，因为它允许我们在多个控制器之间共享公共缓存。 扩展广播者需要我们为每个wach保留重复的缓存。

// SharedInformer has a shared data cache and is capable of distributing notifications for changes

// to the cache to multiple listeners who registered via AddEventHandler. If you use this, there is

// one behavior change compared to a standard Informer.  When you receive a notification, the cache

// will be AT LEAST as fresh as the notification, but it MAY be more fresh.  You should NOT depend

// on the contents of the cache exactly matching the notification you've received in handler

// functions.  If there was a create, followed by a delete, the cache may NOT have your item.  This

// has advantages over the broadcaster since it allows us to share a common cache across many

// controllers. Extending the broadcaster would have required us keep duplicate caches for each

// watch.

type SharedInformer interface {

        // AddEventHandler adds an event handler to the shared informer using the shared informer's resync

        // period.  Events to a single handler are delivered sequentially, but there is no coordination

        // between different handlers.

        AddEventHandler(handler ResourceEventHandler)

        // AddEventHandlerWithResyncPeriod adds an event handler to the shared informer using the

        // specified resync period.  Events to a single handler are delivered sequentially, but there is

        // no coordination between different handlers.

        AddEventHandlerWithResyncPeriod(handler ResourceEventHandler, resyncPeriod time.Duration)

        // GetStore returns the Store.

        GetStore() Store

        // GetController gives back a synthetic interface that "votes" to start the informer

        GetController() Controller

        // Run starts the shared informer, which will be stopped when stopCh is closed.

        Run(stopCh <-chan struct{})

        // HasSynced returns true if the shared informer's store has synced.

        HasSynced() bool

        // LastSyncResourceVersion is the resource version observed when last synced with the underlying

        // store. The value returned is not synchronized with access to the underlying store and is not

        // thread-safe.

        LastSyncResourceVersion() string

}

type SharedIndexInformer interface {

        SharedInformer

        // AddIndexers add indexers to the informer before it starts.

        AddIndexers(indexers Indexers) error

        GetIndexer() Indexer

}

　　

怀疑是代码自动生成的。

git grep "func NewSharedInformerFactory"

pkg/client/informers/externalversions/factory.go:func NewSharedInformerFactory(client versioned.Interface, defaultResync time.Duration) SharedInformerFactory {

pkg/client/informers/externalversions/factory.go:func NewSharedInformerFactoryWithOptions(client versioned.Interface, defaultResync time.Duration, options ...SharedInformerOption) SharedInformerFactory {

vendor/k8s.io/client-go/informers/factory.go:func NewSharedInformerFactory(client kubernetes.Interface, defaultResync time.Duration) SharedInformerFactory {

vendor/k8s.io/client-go/informers/factory.go:func NewSharedInformerFactoryWithOptions(client kubernetes.Interface, defaultResync time.Duration, options ...SharedInformerOption) SharedInformerFactory {

vendor/k8s.io/code-generator/_examples/MixedCase/informers/externalversions/factory.go:func NewSharedInformerFactory(client versioned.Interface, defaultResync time.Duration) SharedInformerFactory {

vendor/k8s.io/code-generator/_examples/MixedCase/informers/externalversions/factory.go:func NewSharedInformerFactoryWithOptions(client versioned.Interface, defaultResync time.Duration, options ...SharedInformerOption) SharedInformerFactory {

vendor/k8s.io/code-generator/_examples/apiserver/informers/externalversions/factory.go:func NewSharedInformerFactory(client versioned.Interface, defaultResync time.Duration) SharedInformerFactory {

vendor/k8s.io/code-generator/_examples/apiserver/informers/externalversions/factory.go:func NewSharedInformerFactoryWithOptions(client versioned.Interface, defaultResync time.Duration, options ...SharedInformerOption) SharedInformerFactory {

vendor/k8s.io/code-generator/_examples/apiserver/informers/internalversion/factory.go:func NewSharedInformerFactory(client internalversion.Interface, defaultResync time.Duration) SharedInformerFactory {

vendor/k8s.io/code-generator/_examples/apiserver/informers/internalversion/factory.go:func NewSharedInformerFactoryWithOptions(client internalversion.Interface, defaultResync time.Duration, options ...SharedInformerOption) SharedInformerFactory {

vendor/k8s.io/code-generator/_examples/crd/informers/externalversions/factory.go:func NewSharedInformerFactory(client versioned.Interface, defaultResync time.Duration) SharedInformerFactory {

vendor/k8s.io/code-generator/_examples/crd/informers/externalversions/factory.go:func NewSharedInformerFactoryWithOptions(client versioned.Interface, defaultResync time.Duration, options ...SharedInformerOption) SharedInformerFactory {

vendor/k8s.io/code-generator/cmd/informer-gen/generators/factory.go:func NewSharedInformerFactory(client {{.clientSetInterface|raw}}, defaultResync {{.timeDuration|raw}}) SharedInformerFactory {

vendor/k8s.io/code-generator/cmd/informer-gen/generators/factory.go:func NewSharedInformerFactoryWithOptions(client {{.clientSetInterface|raw}}, defaultResync {{.timeDuration|raw}}, options ...SharedInformerOption) SharedInformerFactory {

　　

5.  生成 controller

"controller.go" 定义了Controller

低层定义见 pkg/client/informers/externalversions/samplecontroller/v1alpha1/foo.go

6.  运行 kubeInformerFactory， exampleInformerFactory 和 controller

(dlv) b k8s.io/sample-controller/pkg/client/informers/externalversions.(*sharedInformerFactory).Start

Breakpoint 5 set at 0xf42f08 for k8s.io/sample-controller/pkg/client/informers/externalversions.(*sharedInformerFactory).Start() ./pkg/client/informers/externalversions/factory.go:111

(dlv) b k8s.io/sample-controller/vendor/k8s.io/client-go/informers.(*sharedInformerFactory).Start

Breakpoint 6 set at 0xefb888 for k8s.io/sample-controller/vendor/k8s.io/client-go/informers.(*sharedInformerFactory).Start() ./vendor/k8s.io/client-go/informers/factory.go:126

// https://github.com/kubernetes/sample-controller/blob/master/pkg/client/informers/externalversions/factory.go

// Start initializes all requested informers.

func (f *sharedInformerFactory) Start(stopCh <-chan struct{}) {

	f.lock.Lock()

	defer f.lock.Unlock()

	for informerType, informer := range f.informers {

		if !f.startedInformers[informerType] {

			go informer.Run(stopCh)

			f.startedInformers[informerType] = true

		}

	}

}

　　

 0  0x0000000000f46733 in main.(*Controller).enqueueFoo

    at ./controller.go:338

 1  0x0000000000f4785e in main.NewController.func1

    at ./controller.go:120

 2  0x0000000000e6f96d in k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.ResourceEventHandlerFuncs.OnUpdate

    at ./vendor/k8s.io/client-go/tools/cache/controller.go:202

 3  0x0000000000e81066 in k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*ResourceEventHandlerFuncs).OnUpdate

    at <autogenerated>:1

 4  0x0000000000e7ee3b in k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*processorListener).run.func1.1

    at ./vendor/k8s.io/client-go/tools/cache/shared_informer.go:552

 5  0x00000000009b478c in k8s.io/sample-controller/vendor/k8s.io/apimachinery/pkg/util/wait.ExponentialBackoff

    at ./vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:203

 6  0x0000000000e7efa9 in k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*processorListener).run.func1

    at ./vendor/k8s.io/client-go/tools/cache/shared_informer.go:548

 7  0x00000000009b4c14 in k8s.io/sample-controller/vendor/k8s.io/apimachinery/pkg/util/wait.JitterUntil.func1

    at ./vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:133

 8  0x00000000009b451e in k8s.io/sample-controller/vendor/k8s.io/apimachinery/pkg/util/wait.JitterUntil

    at ./vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:134

 9  0x00000000009b444d in k8s.io/sample-controller/vendor/k8s.io/apimachinery/pkg/util/wait.Until

    at ./vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:88

10  0x0000000000e7a58d in k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*processorListener).run

    at ./vendor/k8s.io/client-go/tools/cache/shared_informer.go:546

11  0x0000000000e7f50a in k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*processorListener).run-fm

    at ./vendor/k8s.io/client-go/tools/cache/shared_informer.go:390

12  0x00000000009b4b8f in k8s.io/sample-controller/vendor/k8s.io/apimachinery/pkg/util/wait.(*Group).Start.func1

    at ./vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:71

13  0x00000000004594e1 in runtime.goexit

    at /usr/local/go/src/runtime/asm_amd64.s:1333

　　

0  0x0000000000f469f0 in main.(*Controller).handleObject

    at ./controller.go:378

 1  0x0000000000f47f5e in main.(*Controller).handleObject-fm

    at ./controller.go:130

 2  0x0000000000e6f8f9 in k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.ResourceEventHandlerFuncs.OnAdd

    at ./vendor/k8s.io/client-go/tools/cache/controller.go:195

 3  0x0000000000e80f32 in k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*ResourceEventHandlerFuncs).OnAdd

    at <autogenerated>:1

 4  0x0000000000e7eecd in k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*processorListener).run.func1.1

    at ./vendor/k8s.io/client-go/tools/cache/shared_informer.go:554

 5  0x00000000009b478c in k8s.io/sample-controller/vendor/k8s.io/apimachinery/pkg/util/wait.ExponentialBackoff

    at ./vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:203

 6  0x0000000000e7efa9 in k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*processorListener).run.func1

    at ./vendor/k8s.io/client-go/tools/cache/shared_informer.go:548

 7  0x00000000009b4c14 in k8s.io/sample-controller/vendor/k8s.io/apimachinery/pkg/util/wait.JitterUntil.func1

    at ./vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:133

 8  0x00000000009b451e in k8s.io/sample-controller/vendor/k8s.io/apimachinery/pkg/util/wait.JitterUntil

    at ./vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:134

 9  0x00000000009b444d in k8s.io/sample-controller/vendor/k8s.io/apimachinery/pkg/util/wait.Until

    at ./vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:88

10  0x0000000000e7a58d in k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*processorListener).run

    at ./vendor/k8s.io/client-go/tools/cache/shared_informer.go:546

11  0x0000000000e7f50a in k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*processorListener).run-fm

    at ./vendor/k8s.io/client-go/tools/cache/shared_informer.go:390

12  0x00000000009b4b8f in k8s.io/sample-controller/vendor/k8s.io/apimachinery/pkg/util/wait.(*Group).Start.func1

    at ./vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:71

13  0x00000000004594e1 in runtime.goexit

    at /usr/local/go/src/runtime/asm_amd64.s:1333

　　

(dlv) print ownerRef

*k8s.io/sample-controller/vendor/k8s.io/apimachinery/pkg/apis/meta/v1.OwnerReference {

        APIVersion: "samplecontroller.k8s.io/v1alpha1",

        Kind: "Foo",

        Name: "example-foo",

        UID: "118da85e-00fa-11e9-96e2-fa163e199d30",

        Controller: *true,

        BlockOwnerDeletion: *true,}

　　

goroutines                                                                                                                                  [41/326]

  Goroutine 1 - User: ./controller.go:171 main.(*Controller).Run (0xf45a11)

  Goroutine 2 - User: /usr/local/go/src/runtime/asm_amd64.s:311 runtime.systemstack_switch (0x457400)

  Goroutine 3 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 4 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 5 - User: ./vendor/k8s.io/klog/klog.go:941 k8s.io/sample-controller/vendor/k8s.io/klog.(*loggingT).flushDaemon (0x5f185b)

  Goroutine 6 - User: /usr/local/go/src/runtime/sigqueue.go:139 os/signal.signal_recv (0x44243c)

  Goroutine 7 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 8 - User: ./pkg/signals/signal.go:36 k8s.io/sample-controller/pkg/signals.SetupSignalHandler.func1 (0xf449f4)

  Goroutine 9 - User: ./vendor/k8s.io/apimachinery/pkg/watch/mux.go:207 k8s.io/sample-controller/vendor/k8s.io/apimachinery/pkg/watch.(*Broadcaster).loop

(0x772ab6)

  Goroutine 10 - User: ./vendor/k8s.io/client-go/tools/record/event.go:231 k8s.io/sample-controller/vendor/k8s.io/client-go/tools/record.(*eventBroadcast$

rImpl).StartEventWatcher.func1 (0xe9d054)

  Goroutine 11 - User: ./vendor/k8s.io/client-go/tools/record/event.go:231 k8s.io/sample-controller/vendor/k8s.io/client-go/tools/record.(*eventBroadcast$

rImpl).StartEventWatcher.func1 (0xe9d054)

  Goroutine 12 - User: ./vendor/k8s.io/client-go/util/workqueue/queue.go:198 k8s.io/sample-controller/vendor/k8s.io/client-go/util/workqueue.(*Type).upda$

eUnfinishedWorkLoop (0xea1212)

  Goroutine 13 - User: /usr/local/go/src/runtime/lock_futex.go:228 runtime.notetsleepg (0x40c4f7)

  Goroutine 14 - User: ./vendor/k8s.io/client-go/util/workqueue/delaying_queue.go:206 k8s.io/sample-controller/vendor/k8s.io/client-go/util/workqueue.(*d$

layingType).waitingLoop (0xe9f2cf)

  Goroutine 15 - User: /usr/local/go/src/runtime/sema.go:510 sync.runtime_notifyListWait (0x43f4fb)

  Goroutine 16 - User: /usr/local/go/src/runtime/sema.go:510 sync.runtime_notifyListWait (0x43f4fb)

  Goroutine 18 - User: /usr/local/go/src/runtime/proc.go:3063 runtime.exitsyscall (0x4353a9)

  Goroutine 20 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 21 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 22 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 34 - User: /usr/local/go/src/runtime/proc.go:3063 runtime.exitsyscall (0x4353a9)

  Goroutine 36 - User: ./vendor/k8s.io/client-go/tools/cache/shared_informer.go:425 k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*sharedP

rocessor).run (0xe79b46)

  Goroutine 37 - User: ./vendor/k8s.io/client-go/tools/cache/controller.go:103 k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*controller).

Run.func1 (0xe7e0d4)

  Goroutine 38 - User: ./vendor/k8s.io/client-go/tools/cache/reflector.go:302 k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*Reflector).w$

tchHandler (0xe764e5)

  Goroutine 41 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 42 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 43 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 44 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 45 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 50 - User: ./vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:374 k8s.io/sample-controller/vendor/k8s.io/apimachinery/pkg/util/wait.poller.fu$

c1.1 (0x9b4d93)

  Goroutine 52 - User: ./vendor/k8s.io/client-go/tools/cache/shared_informer.go:425 k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*shared$

rocessor).run (0xe79b46)

  Goroutine 53 - User: ./vendor/k8s.io/client-go/tools/cache/controller.go:103 k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*controller)$

Run.func1 (0xe7e0d4)

  Goroutine 54 - User: ./vendor/k8s.io/client-go/tools/cache/reflector.go:302 k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*Reflector).w$

tchHandler (0xe764e5)

  Goroutine 58 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 59 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 60 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 61 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 62 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 63 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 65 - User: /usr/local/go/src/runtime/netpoll.go:173 internal/poll.runtime_pollWait (0x428dc6)

  Goroutine 66 - User: ./vendor/k8s.io/client-go/tools/cache/shared_informer.go:549 k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*proces$

orListener).run.func1.1 (0xe7ed04)

  Goroutine 67 - User: ./vendor/k8s.io/client-go/tools/cache/shared_informer.go:517 k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*proces$

orListener).pop (0xe7a356)

  Goroutine 68 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 69 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 71 - User: ./vendor/k8s.io/client-go/tools/cache/reflector.go:207 k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*Reflector).L$

stAndWatch.func1 (0xe7e56d)

  Goroutine 72 - User: /usr/local/go/src/runtime/lock_futex.go:228 runtime.notetsleepg (0x40c4f7)

  Goroutine 74 - User: /usr/local/go/src/runtime/sema.go:510 sync.runtime_notifyListWait (0x43f4fb)

* Goroutine 82 - User: ./controller.go:341 main.(*Controller).enqueueFoo (0xf46741) (thread 12081)

  Goroutine 83 - User: ./vendor/k8s.io/client-go/tools/cache/shared_informer.go:517 k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*process

orListener).pop (0xe7a356)

  Goroutine 99 - User: ./vendor/k8s.io/client-go/tools/cache/reflector.go:207 k8s.io/sample-controller/vendor/k8s.io/client-go/tools/cache.(*Reflector).Li

stAndWatch.func1 (0xe7e56d)

  Goroutine 102 - User: /usr/local/go/src/runtime/sema.go:510 sync.runtime_notifyListWait (0x43f4fb)

  Goroutine 103 - User: /usr/local/go/src/runtime/sema.go:510 sync.runtime_notifyListWait (0x43f4fb)

  Goroutine 114 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 146 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

  Goroutine 179 - User: /usr/local/go/src/runtime/sema.go:510 sync.runtime_notifyListWait (0x43f4fb)

  Goroutine 187 - User: /usr/local/go/src/runtime/proc.go:303 runtime.gopark (0x42e3db)

　　

Other:

Understanding kubernetes networking: ingress

Load Balance East-West Traffic in Kubernetes Environment Using NetScaler CPX

Kubernetes网络分析之Flannel

How we run Kubernetes in Kubernetes aka Kubeception

Istio Handbook——Istio中文指南/服务网格实践手册

Kubernetes与云原生应用概览

比较典型CRD的例子是：

基于Helm和Operator的K8S应用管理

带你入门operator-framework

CoreOS有状态应用管理的框架--Operator详解

如何在GO语言中使用Kubernetes API？

视频： 沃趣：袁琳峰-使用 Operator 来扩展 Kubernetes

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